Had Constantine established some religion other than Christianity -- say, Mithraism -- we would no doubt be celebrating the Tauroctony every spring and the birth of Mithras at the winter solstice. And if Mithraic scholars were to unearth copies of Mark or Luke from the Judean desert, the scrolls would be treated as cultic mystery stories of purely historical interest. Religion is as contingent and mutable as any other human cultural invention.